Lens assembly
AssigneesSintai Optical (Shenzhen) Co., Ltd., Asia Optical Co., Inc.
InventorsHsi-Ling Chang, Guo-Yang Wu, Chien-Hung Chen, Ming-Huang Tseng
Life of this patent
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Abstract
A lens assembly includes a first, second, third, and fourth in order from an object side to an image side along an optical axis. The first lens is a meniscus lens with positive refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The second lens is with negative refractive power. The third lens is with positive refractive power. The fourth lens is a meniscus lens with refractive power. The lens assembly satisfies at least one of following conditions: −0.1≤R11/R42≤0.53; 2≤TTL/SD4≤7; 0.1≤SD1/f≤0.6.
Claims19
A lens assembly comprising:
- a first lens which is a meniscus lens with positive refractive power and comprises a convex surface facing an object side, and a concave surface facing an image side;
- a second lens which is with negative refractive power;
- a third lens which is with positive refractive power;
- and
- a fourth lens which is a meniscus lens with refractive power;
- wherein the first lens, the second lens, the third lens, and the fourth lens are arranged in order from the object side to the image side along an optical axis;
- wherein the lens assembly has fixed effective focal length;
- wherein the lens assembly satisfies following conditions:
- 19
- ≤
- ❘
- "\[LeftBracketingBar]"
- f
-
- 4
- /
- BFL
- ❘
- "\[RightBracketingBar]"
- ≤
- 52
- ;
- wherein f4 is an effective focal length in mm of the fourth lens, and BFL is an interval in mm from the image side surface of the fourth lens to an image plane along the optical axis.
A lens assembly consisting of a first lens, a second lens, a third lens, and a fourth lens, wherein:
- the first lens is a meniscus lens with positive refractive power and comprises a convex surface facing an object side, and a concave surface facing an image side;
- the second lens is with negative refractive power;
- the third lens is with positive refractive power;
- and
- the fourth lens is a meniscus lens with refractive power;
- the first lens, the second lens, the third lens, and the fourth lens are arranged in order from the object side to the image side along an optical axis;
- the lens assembly has fixed effective focal length;
- and
- the lens assembly satisfies at least one of following conditions:
- -
- 0
- .
- 1
- ≤
- R
- 1
-
- 1
- /
- R
- 4
-
- 2
- ≤
- 0.53
- ;
- 0.1
- ≤
- SD
-
- 1
- /
- f
- ≤
- 0.6
- ;
- -
- 10
- ≤
- f
-
- 4
- /
- BFL
- ≤
- -
- 3
- ;
- wherein R11 is a radius of curvature of the convex surface of the first lens, R42 is a radius of curvature of the image side surface of the fourth lens, SD1 is an optical effective diameter in mm of the first lens, f is an effective focal length in mm of the lens assembly, f4 is an effective focal length in mm of the fourth lens, and BFL is an interval in mm from the image side surface of the fourth lens to an image plane along the optical axis.
A lens assembly comprising:
- a first lens which is a meniscus lens with positive refractive power and comprises a convex surface facing an object side, and a concave surface facing an image side;
- a second lens which is with negative refractive power and comprises a convex surface facing the object side;
- a third lens which is with positive refractive power;
- and
- a fourth lens which is a meniscus lens with negative refractive power and comprises a concave surface facing the object side and a convex surface facing the image side;
- wherein the first lens, the second lens, the third lens, and the fourth lens are arranged in order from the object side to the image side along an optical axis;
- wherein the lens assembly has fixed effective focal length;
- wherein the fourth lens comprises a concave surface facing the object side and a convex surface facing the image side while the second lens comprises a convex surface facing the object side, or the fourth lens comprises a convex surface facing the object side and a concave surface facing the image side while the second lens comprises a concave surface facing the object side;
- wherein the lens assembly satisfies at least one of following conditions:
- 0
- .
- 1
- ≤
- S
-
- D
-
- 1
- /
- f
- ≤
- 0
- .
- 6
- ;
- wherein SD1 is an optical effective diameter in mm of the first lens and f is an effective focal length in mm of the lens assembly.
Dependencies are inferred from the claim text.